Pneumatic tire.



No. 778,136. PATENTEDDEO.20,1-904.

- P. MAGNUS.

PNEUMATIG TIRE.

APPLICATION FILED 0015, 1904.

H0 MODEL.

I 7 UNITED STAT s Patented December 20, 1904.

PATENT OFFICE.

PNEUMATIC TIRE.

SPECIFICATION forming part of Letters Patent No. 778,136, dated December'QO, 1904.

Application filed October 5,1904., Serial No. 227,227. i

To all whom it may concern.-

them, while the liability of india-rubber cov.

ers to puncture is a serious objection; but with my present invention, which is an im provement on my prior patent, No. 740,57 8, the advantages of leather and rubber are combined without the disadvantages to which they are subject when separated. Y

Referring to the drawings which form a part of this specification,Figure l'repres'ents a section of a cycle-tire with .my invention applied. Fig. 2 shows in section my invention as applied to a motor-cycle tire. represents a tire-cover built according to my invention and suitable for light or medium motor-cars. Fig. 4. depicts .acover suitable for heavy cars. Fig. 5represents in section a side elevation of one of my solution-impregnated clrcumferential segments. Flg. 6 shows a section of Fig. 5. Fig. 7 depicts a side elevation of a number of my solution-impregnatied circumferential segments placed end to en Similar letters of reference indicate similar or corresponding parts where they occur in the several views.

My invention includes a hide which is split into two sheets of leatherthe skin, or outer, and'the flesh, or inner, portion. I do not use the skin portion; but the cheaper flesh portion is then treated in any well-known way to remove therefrom excess of grease or other impurities. The cleansed leather is then cut into the strips or circumferential segments marked A in the drawings. Thesein length are as long as possible, and their width will depend upon the diameter of the tire and Fig. 3

other conditions. These strips are then immersed for twelve hours (more, or less) in a solution of mineral naphtha and caoutchouc or india-rubber. This solution consists approximately of seventy (70) per cent. of naphtha and thirty (30) per cent. of rubber. While immersed they are subjected to moderate movement and, if necessary, may be placed on edge. Each strip is then introduced to a pricking and impregnating machine. This consists of two rollers, one above the other or side by side. These rollers (the distance between which is adjustable) are one-eighth of an inch apart, (more or'less,) and the circumference of one orof both is studded with prickers. The area, length, and section of these will depend upon circumstances. some leathers they may be round and pointed, While for others they-may be square or of other section and unpointed. 'With some leathers the prickers areneither pointed nor parallel, but larger at the point than at the root. Upon these rollers falls or is sprayed a solution of approximately sixty per cent. of naphtha and forty (40) per cent. of rubber. The rollers'are therefore covered with solution, and as the prickers leave the leather the-solution enters. A collector below gathers the overflow solution for reuse.

- Instead of the circumferential segments passing between rollers they may be placed.

beneath a stamp from below which prickers protrude. perforated, and through the perforations the solution is forced into the leather before the prickers are withdrawn.

After pricking, the strips are immersed for twelve hours (more or less) in a solution of approximately sixty (60) per cent. of naphtha For The said prickers are hollow and I ered with an adhesive and the edges F folded back upon the said outer surface, inelosing a wire or ring G or a clenching-ring H. The fabric is then removed from the former and its outer surface treated at suitable intervals with further solutions of naphtha and rubber. The fabric is then replaced on the former, and an inner composition J, approximately twenty (20) per cent. of naphtha and eighty (80) per cent. of rubber, is applied to its cireumfer ence. The thickness and width of this will depend upon the purposes for which the tire is to be used. One by one the circumferential segments A are then applied to the composition, an upper wedge-point B being placed over a lower one C. A circle is thus completed formed by a series of segments. Between each lapping joint thus formed an adhesive solution is applied. On the exterior of the circumferential segments another layer K of the last composition is applied, the thickness and width of which will depend upon conditions. This is hereinafter called the outer composition K. The cover thus formed is ready for the application thereto of heat and pressure, whereby all the parts are completely united. When completed, the cover is at tached to the rim M and covers the air-tube N. For heavier tires another ring, an outer ring A of circumferential segments, is applied to the composition K. Outside this is placed another ring, L, of composition, hereinafter called the outermost composition. I do not bind myself to the number of the said rings of circumferential segments.

For heavier tires the reduced edges of the circumferential segments instead of onlycovering the tread, as seen in Fig. 1, extend to and below the walls of the tire, as seen in Figs. 2 and 4.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In pneumatic tires a series of segments formed of flesh leather, said segments having been immersed in a solution approximately of seventy per cent. of naphtha and thirty (30) per cent. india-rubber, then passed between rollers having priclrers and a solution of approximately sixty (60) per cent. naphtha and forty (40) per cent. india-rubber on the rollers, then immersed in a solution approximatel y of sixty (60) per cent. naphtha and forty (40) per cent. india-rubber, each segment having its sides reduced and its edges wedgepointed all as and for the purpose hereinbefore described.

2. A pneumatic-tire cover comprising an inner layer or fabric, a circumferential series of leather segments surrounding said inner layer each segment having been impregnated with a solution of approximately sixty per cent. of mineral naphtha and forty per cent. of

rubber; and an outer layer formed of a composition of approximately twenty per cent. of mineral naphtha and eighty per cent. of rubber, the aforesaid parts being subjected to heat and pressure to unite them, substantially as and for the purposes described.

3. A cover for pneumatic tires formed of an innerlayer of fabric, a composition around said layer formed of approximately twenty per cent. of mineral naphtha and forty per cent. of rubber; a series of leather segments encircling said fabric, each segment having been impregnated with a solution of ap n'oximately sixty per cent. of mineral naphtha and forty per cent. of rubber; and an outer composition of approximately twenty per cent. of mineral naphtha and eighty per cent. of rubber; said fabric, composition, segments and outer composition being united by heat and pressure, substantially as and for the purpose described.

4. In pneumatic tires a cover formed of an endless fabric, a composition around said tab- 5 ric approximately of twenty (20) per cent. mineral naphtha and forty (4-0) per cent. rubber, outside said fabric a series ol flesh leather circumferential segments forming a circle, each segment having reduced side edges, an upper wedge-point at one end, a lower wedge-point at the other, said segment having been pricked and impregnated with a solution of approximately sixty ((50) per cent. of mineral naphtha and forty (i0) per cent. of rubber, an outer composition of approximately twenty (20) per cent. of mineral naphtha and eighty per cent. of rubber, around said segments, said fabric, composition, segments and outer composition being subiected to heat and pressure, all as and for the purposes hereinbefore described.

5. In pneumatic tires a cover formed of an endless fabric, a wire, or clenching-ring inclosed in each edge, an inner composition of 5 approximately twenty (20) per cent. mineral naphtha and eighty (80) per cent. rubber around the fabric, inner circuml erential flesh leather segments having their side edges reduced and at one end an upper wedge- 1 10 point and at the other a lower wedge-point,sai l wedge-points being united by an adhesive, said segments having been pricked and impregnated and forming aring,an outer composition of approximately twenty (20) percent. mineral 1 1 5 naphtha and eighty (80) per cent. rubber, an outer ring of segments, and an outermost composition, all as and for the purposes hereinbefore described.

In witness whereof I have hereunto set my 120 hand to this specification in the presence of two witnesses.

PHIL] l" MAGN US. lVitnesses:

EDWIN Pnnmirs, CECIL \V. Le lLAs'rnInn. 

